#header {
    position: relative;
    top: 0px;
    width: 100%;
}

#left_panel {
     position: relative;
     left: 0px;
     top: 0px;
     width: 20%;
     /*float: left;*/
}

#content_panel {
     position: relative;
     left: 0px;
     top: 0px;
     width: 80%;
     /*float: left;*/
}

button {
    width: 8em;
}

a {
    color: inherit;
}